One important point, however, that seems be overlooked too often is the importance of lower-case letters. Only a small fraction of letters in written language are upper-case. Yet, they seem to be the focus of most alphabet-related products. In order for children to be ready for early reading, lower-case letter recognition is extremely important.
Further, it is very helpful if children have an understanding that the upper-case letters and their lower-case counterparts are essentially the same. When sounding words out, they make the same sound whether they are upper- or lower-case. Therefore, activities that help children link those letters in their minds are very useful. For example, matching games, coloring pages, or books which show both upper-case and lower-case letters together reinforce their connection.